Hirobo HI2521129 Collar 3 x 8 x 3 - General Helicopter Collar  [HI2521129]

Helicopter Collar Overview

This Hirobo HI2521129 collar is an RC-scale accessory sized 3 x 8 x 3 designed as a general collar component for helicopter assemblies. It functions as a simple locating sleeve to maintain axial spacing on small shafts and linkages inside model helicopters and related rotating subassemblies.

Installation is straightforward: slide the collar onto the shaft to the required position and secure adjacent hardware according to the airframe's assembly method. Because the collar is intended for positioning rather than carrying heavy loads, confirm fit and alignment with the mating shaft or bushing to avoid binding and ensure free movement.

For routine checks, inspect the collar for signs of wear or radial play after flights or impacts. Replace the collar if any deformation or looseness appears to preserve control linkage geometry and consistent rotor tracking.